Hard Brake Pedal - Potential Brake Booster or Vacuum Issue
A consistently hard brake pedal in a 2021 Tesla Model Y indicates a loss of power brake assist, likely due to a failed brake booster, vacuum pump, or related component. This significantly increases stopping effort and poses a safety risk.
Diagnosis Details
Possible Causes
Failed brake booster (vacuum assist unit) - internal diaphragm leak or mechanical failure
Malfunctioning vacuum pump (electric or engine-driven) - not generating sufficient vacuum
Vacuum hose leak or blockage - cracked, disconnected, or clogged hose between booster and pump
Brake master cylinder internal failure - piston seal or bypass issue
Related OBD-II Codes
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What You Should Do
Do not drive the vehicle until repaired.
Have the brake system inspected immediately by a qualified technician.
Check vacuum pump operation, booster function, and all vacuum lines.
Test brake master cylinder if needed.
Related Repairs
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.